There are over 250 solar module makers worldwide, a large % of them concentrated in China, not surprisingly.

Here are the prominent solar module makers (and their countries). These are typically large firms, with many of them having capacities to supply over 1 GW (and some of them can supply even 5 GW or more of solar modules every year!):

Mind you, the above list does not mean that these are the only high quality solar panel makers in the world. There are a number of small and medium solar panel makers whose quality could be as good as that of the ones listed above.